LATEST: Socialite Paris Hilton has apologised to the owners of Las Vegas nightclub Pure after fuming when they refused entry to her underage boyfriend STAVROS NIARCHOS.

The Greek shipping heir, 19, attempted to enter nightspot Pure for the New Year's Eve party (31DEC05), which Hilton's younger sister NICKY was hosting, but was turned away because he was two years shy of the legal drinking age.

According to the Las Vegas Review Journal, the Hilton sisters loudly stormed out of Pure at 3.30am on New Year's Day (01JAN06) because security bosses turned Niarchos away.

Pure boss STEVE DAVIDOVICI says, "He was definitely, 100 per cent not allowed in the club," but confirmed the sisters apologised on Monday (02JAN06).

Earlier in the evening, Niarchos had been forced to welcome in 2006 in Tao's restaurant due to his age, despite Paris being paid $100,000 (GBP55,555) to host the bash in the adjoining nightclub.